Every auto has to be TRACABLE by authorities. Where it came from, how you got it, and who owns it.
The MSO: Manufactucturer Statement Of Origin is issued by the Car Company to the dealer who buys the car, so the dealer has PROOF of where he got the car and that he has a legal right to possess it.
The MSO is the Dealers proof that the vehicle is not a stolen vehicle.
It varifies where it came from, how the dealer got it, and that he legally has a right to possess and own it.
It's like a more detailed receipt you get when you make a retail purchase at a store, which provides proof of purchase, place of purchase, right to ownership and legally possess what you have.
The purchase receipt is your proof the item is not a stolen item.